<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    function readonly(target, name, descriptor) {
      descriptor.writable = false
      return descriptor
    }

    // 设置某个方法只读
    class Person {
      constructor() {
        this.name = 'A'
        this.age = 12
      }

      @readonly
      testname() {
        return `${this.name}, ${this.age}`
      }
    }
    const B = new Person()
    console.log(B.testname())
    B.testname = function () { }
  </script>
</body>

</html>
